|Publication number||US7540837 B2|
|Application number||US 11/253,062|
|Publication date||Jun 2, 2009|
|Filing date||Oct 18, 2005|
|Priority date||Oct 18, 2005|
|Also published as||CA2624751A1, CA2624751C, US7540838, US20070084639, US20070087927|
|Publication number||11253062, 253062, US 7540837 B2, US 7540837B2, US-B2-7540837, US7540837 B2, US7540837B2|
|Inventors||Eric Scott, Lyndon Ray Stone, Richard James Koch|
|Original Assignee||Varco I/P, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (100), Non-Patent Citations (1), Referenced by (17), Classifications (12), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of the Invention
This invention relates generally to centrifuges, to centrifuges for processing drilling fluids or muds, and to methods of their use.
2. Description of Related Art
Centrifuges used in the oil industry process drilling fluids known as “mud” to separate undesired drilling solids from liquid mud. Some centrifuges, because of their continuous operation, have the advantage of being less susceptible to plugging by solids. Also, they may be shut down for long or short periods of time and then restarted with minimum difficulty, unlike certain centrifuges which require cleaning to remove dried solids. Often the solids/liquid mixture is processed at high feed rates.
To accommodate high feed rates, high torques can be encountered, much energy is required to process the mixture, and the centrifuge can be of considerable size.
When such a centrifuge is used to process drilling material (drilling fluid with drilled cuttings therein), changing mud flow conditions often require a human operator to frequently adjust centrifuge pump speeds to optimize centrifuge treating performance. Centrifuge operation can be a compromise between high performance and long intervals between maintenance and repair operations.
In some instances, a centrifuge is used in an effort to control the plastic viscosity of mud. A desired plastic viscosity is a function of the type of mud (water, oil, synthetic-based), the mud density, and other variables. When mud viscosity is too high, the feed pump is run faster; when mud viscosity is too low, the feed pump is run slower or turned off. Often mud properties are measured only periodically, resulting in a saw-tooth effect on the mud viscosity.
The present invention discloses, in certain aspects, a system for controlling viscosity of drilling fluid, the system including: a container of drilling fluid material, the drilling fluid containing solids; a viscosity sensor for sensing viscosity of the drilling fluid material in the container and for producing viscosity signals indicative of said viscosity; a centrifuge for removing solids from the drilling fluid material, the centrifuge having a rotatable bowl and a rotatable screw conveyor; pump apparatus for pumping drilling fluid material from the container to the centrifuge; bowl drive apparatus for driving the rotatable bowl; conveyor drive apparatus for driving the rotatable conveyor; pump drive apparatus for driving the pump apparatus; and a control system for receiving viscosity signals from the viscosity sensor and for controlling the centrifuge and the pump apparatus in response to said viscosity signals so that selected solids from drilling fluid material processed by the centrifuge are reintroducible back into the container to control viscosity of drilling fluid material in the container.
In certain embodiments, the present invention discloses a centrifuge system that automatically controls drilling mud viscosity in a drilling system. Sensors measure mud viscosity and mud density. The mud density is used to determine an optimal viscosity. The optimal viscosity is used then as a set point for a control system. A value of measured viscosity is compared to the desired set point value. Based on this comparison, action is taken to increase or decrease mud viscosity, resulting in the maintenance of optimum and consistent mud properties. In certain aspects, the need for operator intervention is reduced or eliminated.
What follows are some of, but not all, the objects of this invention. In addition to the specific objects stated below for at least certain preferred embodiments of the invention, other objects and purposes will be readily apparent to one of skill in this art who has the benefit of this invention's teachings and disclosures. It is, therefore, an object of at least certain preferred embodiments of the present invention to provide:
New, useful, unique, efficient, nonobvious drilling fluid viscosity control and/or density control systems and methods of their use.
Certain embodiments of this invention are not limited to any particular individual feature disclosed here, but include combinations of them distinguished from the prior art in their structures and functions. Features of the invention have been broadly described so that the detailed descriptions that follow may be better understood, and in order that the contributions of this invention to the arts may be better appreciated. There are, of course, additional aspects of the invention described below and which may be included in the subject matter of the claims to this invention. Those skilled in the art who have the benefit of this invention, its teachings, and suggestions will appreciate that the conceptions of this disclosure may be used as a creative basis for designing other structures, methods and systems for carrying out and practicing the present invention. The claims of this invention are to be read to include any legally equivalent devices or methods which do not depart from the spirit and scope of the present invention.
The present invention recognizes and addresses the problems and long-felt needs and provides a solution to those problems and a satisfactory meeting of those needs in its various possible embodiments and equivalents thereof. To one skilled in this art who has the benefits of this invention's realizations, teachings, disclosures, and suggestions, other purposes and advantages will be appreciated from the following description of preferred embodiments, given for the purpose of disclosure, when taken in conjunction with the accompanying drawings. The detail in these descriptions is not intended to thwart this patent's object to claim this invention no matter how others may later disguise it by variations in form or additions of further improvements.
The Abstract that is part hereof is to enable the U.S. Patent and Trademark Office and the public generally, and scientists, engineers, researchers, and practitioners in the art who are not familiar with patent terms or legal terms of phraseology to determine quickly from a cursory inspection or review the nature and general area of the disclosure of this invention. The Abstract is neither intended to define the invention, which is done by the claims, nor is it intended to be limiting of the scope of the invention in any way.
It will be understood that the various embodiments of the present invention may include one, some, or all of the disclosed, described, and/or enumerated improvements and/or technical advantages and/or elements in claims to this invention.
A more particular description of embodiments of the invention briefly summarized above may be had by references to the embodiments which are shown in the drawings which form a part of this specification. These drawings illustrate certain preferred embodiments and are not to be used to improperly limit the scope of the invention which may have other equally effective or legally equivalent embodiments.
As shown in
Weirs 119 a (two of which are shown) are provided through the flanged portion of the shaft 19 for discharging the separated liquid.
As shown in
A computer system (“SBC”) 70 controls an I/O module 50 and a variable frequency drives (“VFD”) 60, 62, and 64. VFD 60 controls bowl speed of the centrifuge 40. VFD 62 controls the screw conveyor of the centrifuge 40. VFD 64 controls a feed pump 42 that pumps drilling fluid or mud to the centrifuge 40. The system 70 computes a desired pump speed (pumping rate). A signal conditioner 20 controls the viscosity sensor 30 and provides power to it. Temperature sensors 24 monitor the temperature of bearings 26 of a centrifuge drive system and send signals indicative of measured temperatures to the Input/Output module 50. The functions of the I/O module 50 include sending data from the sensors to the system 70 and sending outputs from the system 70 to the VFD 60. The signal conditioner 20 sends signals to the I/O module 50 indicative of viscosity values measured by the viscosity sensor 30. The density sensor(s) sends signals indicative of measured mud densities to the I/O module. The I/O module provides density measurements to the computer system. The I/O module provides command signals from the system 70 to a variable frequency drive (“VFD”) 60. As desired, one or more agitators may be used in the tank 16.
Continuous density measurements made by the density sensor(s) are used by the computer system 70 to determine a desired value for a mud viscosity set point (e.g. using known equations or a look-up table). The computer system 70 compares actual viscosity measurements from the viscosity sensor 30 (processed by the signal conditioner 20) to the determined desired value and then the computer system 70 calculates the difference between the pre-determined set point and a current actual viscosity value. Following this calculation, the computer system 70 changes the operational parameters of the VFDs to run a bowl and/or conveyor of the centrifuge 40 faster or slower or to control pump speed. The computer system 70, which can run periodically or continuously, provides output(s) to a display device 80 (e.g. a monitor, screen, panel, laptop, handheld or desktop computer, etc., remote and/or on site.
In addition to recovering desirable solids for drilling, the methods of
The present invention, therefore, provides in certain, but not necessarily all embodiments, a system for controlling viscosity of drilling fluid, the system including a container of drilling fluid material, the drilling fluid containing solids, a viscosity sensor for sensing viscosity of the drilling fluid material in the container and for producing viscosity signals indicative of said viscosity, a centrifuge for removing solids from the drilling fluid material, the centrifuge having a rotatable bowl and a rotatable screw conveyor, pump apparatus for pumping drilling fluid material from the container to the centrifuge, bowl drive apparatus for driving the rotatable bowl, conveyor drive apparatus for driving the rotatable conveyor, pump drive apparatus for driving the pump apparatus, and a control system for receiving viscosity signals from the viscosity sensor and for controlling the centrifuge and the pump apparatus in response to said viscosity signals so that selected solids from drilling fluid material processed by the centrifuge are reintroducible back into the container to control viscosity of drilling fluid material in the container. Such a system may have one or some, in any possible combination, of the following: wherein the control system and the pump apparatus are operable continuously; wherein each drive apparatus is a variable frequency drive; wherein the pump apparatus is operable at a selected pumping rate; density sensor apparatus for measuring density of the drilling fluid material and for producing density signals indicative of measured density, the control system including computer apparatus for receiving signals indicative of the density measured by the density sensor apparatus and for calculating a desired viscosity value based on said measured density, the computer apparatus for comparing the desired viscosity value to viscosity value as sensed by the viscosity sensor, and the computer apparatus for controlling the drive apparatuses to maintain sensed viscosity value at or near the desired viscosity value; the control system including computer apparatus, and display apparatus for displaying results of operation of the computer apparatus; wherein the centrifuge is a low speed centrifuge; wherein the centrifuge is operable to separate barite solids from the drilling fluid material and said barite solids are returnable to the container; and/or wherein the centrifuge is a high speed centrifuge.
The present invention, therefore, provides in certain, but not necessarily all embodiments, a system for controlling viscosity of drilling fluid, the system including a container of drilling fluid material, the drilling fluid containing solids, a viscosity sensor for sensing viscosity of the drilling fluid material in the container and for producing viscosity signals indicative of said viscosity, a centrifuge for removing solids from the drilling fluid material, the centrifuge having a rotatable bowl and a rotatable screw conveyor, pump apparatus for pumping drilling fluid material from the container to the centrifuge, bowl drive apparatus for driving the rotatable bowl, conveyor drive apparatus for driving the rotatable conveyor, pump drive apparatus for driving the pump apparatus, and a control system for receiving viscosity signals from the viscosity sensor and for controlling the centrifuge and the pump apparatus in response to said viscosity signals so that selected solids from drilling fluid material processed by the centrifuge are reintroducible back into the container to control viscosity of drilling fluid material in the container, wherein the control system and the pump apparatus are operable continuously, wherein the each drive apparatus is a variable frequency drive, wherein the pump apparatus is operable at a selected pumping rate, the control system including computer apparatus, and display apparatus for displaying results of operation of the computer apparatus.
The present invention, therefore, provides in certain, but not necessarily all embodiments, a system for controlling density of drilling fluid, the system including a container of drilling fluid material, the drilling fluid containing solids, a density sensor for sensing density of the drilling fluid material in the container and for producing density signals indicative of said density, a centrifuge for removing solids from the drilling fluid material, the centrifuge having a rotatable bowl and a rotatable screw conveyor, pump apparatus for pumping drilling fluid material from the container to the centrifuge, bowl drive apparatus for driving the rotatable bowl, conveyor drive apparatus for driving the rotatable conveyor, pump drive apparatus for driving the pump apparatus, and a control system for receiving density signals from the density sensor and for controlling the centrifuge and the pump apparatus in response to said density signals so that selected solids from drilling fluid material processed by the centrifuge are reintroducible back into the container to control density of drilling fluid material in the container.
The present invention, therefore, provides in certain, but not necessarily all embodiments, a method for controlling viscosity of drilling fluid material, the method including feeding drilling fluid material to a system for processing, the system as any disclosed herein for controlling viscosity, and controlling the centrifuge in response to viscosity signals to control the viscosity of the drilling fluid material in the container.
The present invention, therefore, provides in certain, but not necessarily all embodiments, a method for controlling density of drilling fluid material, the method including feeding drilling fluid material to a system for processing, the system as any disclosed herein for controlling density, and controlling the centrifuge in response to density signals to control the density of the drilling fluid material in the container.
The present invention, therefore, provides in certain, but not necessarily all embodiments, a computer readable medium containing instructions that when executed by a computer implement a method according to the present invention (any method disclosed herein according to the present invention).
In conclusion, therefore, it is seen that the present invention and the embodiments disclosed herein and those covered by the appended claims are well adapted to carry out the objectives and obtain the ends set forth. Certain changes can be made in the subject matter without departing from the spirit and the scope of this invention. It is realized that changes are possible within the scope of this invention and it is further intended that each element or step recited in any of the following claims is to be understood as referring to all equivalent elements or steps. The following claims are intended to cover the invention as broadly as legally possible in whatever form it may be utilized. The invention claimed herein is new and novel in accordance with 35 U.S.C. § 102 and satisfies the conditions for patentability in § 102. The invention claimed herein is not obvious in accordance with 35 U.S.C. § 103 and satisfies the conditions for patentability in § 103. This specification and the claims that follow are in accordance with all of the requirements of 35 U.S.C. § 112. The inventors may rely on the Doctrine of Equivalents to determine and assess the scope of their invention and of the claims that follow as they may pertain to apparatus not materially departing from, but outside of, the literal scope of the invention as set forth in the following claims.
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|U.S. Classification||494/7, 494/10, 494/42, 494/53, 494/37|
|International Classification||B04B13/00, B04B1/20|
|Cooperative Classification||E21B21/065, E21B21/062, B04B13/00|
|European Classification||E21B21/06M, E21B21/06N2|
|Jan 23, 2006||AS||Assignment|
Owner name: VARCO I/P, INC., TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCOTT, ERIC;STONE, LYNDON RAY;KOCH, RICHARD JAMES;REEL/FRAME:017493/0207
Effective date: 20060118
|Oct 1, 2012||FPAY||Fee payment|
Year of fee payment: 4